A self-hosted Minstrel server is usually on the LAN, but ConnectivityObserver
gated 'online' on NET_CAPABILITY_VALIDATED — which tracks whether Android
reached its own WAN internet-validation probe, not whether Minstrel is
reachable. A transient WAN/DNS blip (or Android's periodic re-validation)
momentarily drops VALIDATED while the LAN server stays reachable. That flipped
ServerHealth -> Offline with NO debounce (only the /healthz path got hysteresis),
and OfflineGatedDataSource fast-failed the in-flight stream read with
OfflineException -> ExoPlayer SOURCE error -> the load_failed 'Source error'
event. On-device: 'app said server offline while it wasn't', one track failed,
then recovered when VALIDATED returned.
- ConnectivityObserver: require INTERNET only, not VALIDATED. The /healthz poll
(VersionCheckController, with its own failure hysteresis) is the authority on
whether Minstrel is reachable; the device-link signal only answers 'is there a
network at all' (airplane mode).
- ServerHealthController: add a WARN-tier transition log. The signal had zero
instrumentation, which is why this was hard to diagnose from logcat.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bvandeusen